MySQL join a table to another table only if [duplicate] - mysql

Question

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conditional join in mysql
(4 answers)
Closed 6 years ago.
I have a little complicated query here. I have to select columns by names cant just user 'orders.*. because i have multiple columns from different tables with the same name.
What I'm trying to do is to select specific fields from orders,users,payment_methods_translation and join bank_accounts_translation only if the orders.payment_method_id = '3'
SELECT
orders.id as orderid,
orders.final_total,
orders.user_id,
orders.auto_cancel,
users.id as userid,
users.first_name,
payment_methods_translation.payment_method_id,
payment_methods_translation.name
FROM
orders,users,
payment_methods_translation
WHERE
orders.id='$id' AND
orders.user_id = users.id AND
orders.payment_method_id = payment_methods_translation.payment_method_id AND
orders.auto_cancel='1'
JOIN
bank_accounts_translation ON (orders.payment_method_id='3'
AND orders.bank_id = bank_accounts_translation.bank_account_id)
But I get a mysql error. So how can I select all the fields from bank_accounts_translation only if orders.payment_method_id = '3' and orders.bank_id = bank_accounts_translation.bank_id

Answer 1

Left join should do it... I
Refactored the code to use the current ANSI standards, you appear to be mixing them.
used table aliases to improve readability.
LEFT JOIN says return all records from prior listed tables and only those that match the on criteria of the table being joined to.
SELECT O.id as orderid
,O.final_total
,O.user_id
,O.auto_cancel
,u.id as userid
,u.first_name
,PMT.payment_method_id
,PMT.name
FROM orders O
INNER JOIN users U
ON O.user_id = U.id
INNER JOIN payment_methods_translation PMT
ON O.payment_method_id = PMT.payment_method_id
LEFT JOIN bank_accounts_translation BAT
ON O.payment_method_id='3'
and O.bank_id = BAT.bank_account_id
WHERE O.id='$id'
and O.auto_cancel='1'